Natural gases in deep strata (>7000 m) in the Kuqa Depression of the Tarim Basin are abundant and well characterized, but oils and condensates are rare and poorly understood. We obtained a sample of petroleum liquid (condensate) from the deep hot reservoir (6930-7012 m, 131 degrees C) in well DB301 with the objective to better understand the origin and the thermal stability of petroleum in deep hot reservoirs. This sample was comprehensively characterized by two-dimensional gas chromatography-mass spectrometry and Fourier transform ion cyclotron resonance mass spectrometry. Abundant biaryl and diarylmethane compounds, diamondoid and ethanodiamondoid hydrocarbons, oxygen and sulfur compounds, and two novel basic nitrogen compounds were determined and quantified in the sample. The composition of DB301 condensate oil suggests that it was generated by coal source rock organofacies. High abundance of ethanodiamondoids with 1-2 cages was identified in coal-sourced oil for the first time. A kind of dicyclic monoterpene pinane (trans and cis iomers) was also identified in the sample, which is probably the first time for determining this kind of monoterpene in petroleum liquids. These ethanodiamondoids, basic nitrogen compounds, and pinanes have excellent thermal stability and therefore can be used as indicators of natural oil cracking.